<template>
  <div class="zyg-uploader__upload">
    <!-- 删除按钮icon -->
    <i
      id="zyg-delete-icon"
      class="van-icon van-icon-clear van-uploader__preview-delete"
    ></i>
    <!-- 照相机icon -->
    <i
      id="zyg-upload-icon"
      class="van-icon van-icon-photograph van-uploader__upload-icon"
    ></i>
    <!-- 上传中 -->
    <div v-show="uploadLoading" class="van-uploader__mask">
      <div class="van-loading van-loading--circular van-uploader__loading">
        <span class="van-loading__spinner van-loading__spinner--circular"
          ><svg viewBox="25 25 50 50" class="van-loading__circular">
            <circle cx="50" cy="50" r="20" fill="none"></circle></svg
        ></span>
      </div>
      <div class="van-uploader__mask-message">上传中...</div>
    </div>
    <img :src="imgUrl" alt="" id="img" class="zyg-image__img" />
    <input
      type="file"
      id="fileId"
      class="zyg-uploader__input"
      accept="image/png,image/jpg,image/jpeg"
      @change="change($event)"
    />
  </div>
</template>
<script>
/* eslint-disable camelcase */

import Cropper from 'cropperjs'
// import Exif from 'exif-js'
export default {
  props: {
    // 定义的宽高比
    widthRate: {
      type: Number,
      default: 1
    },
    // 定义的宽高比
    heightRate: {
      type: Number,
      default: 1
    },
    imgUrl: {
      type: String,
      default: function () {
        return ''
      }
    },
    uploadLoading: {
      type: Boolean,
      default: false
    }
  },
  data () {
    return {}
  },
  mounted () {
    this.iconFun()
  },
  methods: {
    iconFun () {
      if (document.getElementById('img').src === '') {
        document.getElementById('zyg-upload-icon').style.display = 'block'
      } else {
        document.getElementById('zyg-upload-icon').style.display = 'none'
      }
    },
    change (event) {
      const self = this
      const image = document.getElementById('img') // 预览对象
      const file = document.getElementById('fileId').files[0] // 获取文件流
      self.$emit('before-upload', file, function (flag) {
        // 上传之前校验
        if (flag === false) {
          return
        }
        // 显示裁剪框
        self.clip(event, {
          resultObj: image,
          aspectWithRatio: Number(self.widthRate),
          aspectHeightRatio: Number(self.heightRate)
        })
      })
    },
    // 初始化方法
    initilize (opt) {
      const self = this
      this.options = opt
      // 创建dom
      this.createElement()
      this.resultObj = opt.resultObj
      // 初始化裁剪对象
      this.cropper = new Cropper(this.preview, {
        aspectRatio: opt.aspectWithRatio / opt.aspectHeightRatio, // 裁剪框比例  默认NaN   例如：: 1 / 1,//裁剪框比例 1：1
        // aspectRatio: 1/1,
        autoCropArea: opt.autoCropArea || 0.8,
        viewMode: 2,
        guides: true, // 是否在剪裁框上显示虚线
        cropBoxResizable: false, // 是否通过拖动来调整剪裁框的大小
        cropBoxMovable: true, // 是否通过拖拽来移动剪裁框。
        dragCrop: false,
        dragMode: 'move', // ‘crop’: 可以产生一个新的裁剪框3 ‘move’: 只可以移动3 ‘none’: 什么也不处理
        center: false, // 是否显示裁剪框中间的+
        zoomable: true, // 是否允许放大图像。
        zoomOnTouch: true, // 是否可以通过拖动触摸来放大图像。
        scalable: true, // 是否允许缩放图片
        // minCropBoxHeight: 750,
        // minCropBoxWidth: 750,
        background: false, // 容器是否显示网格背景
        checkOrientation: true,
        checkCrossOrigin: true,
        zoomOnWheel: false, // 是否允许鼠标滚轴缩放图片
        toggleDragModeOnDblclick: false,
        ready: function () {
          // console.log(self.cropper.rotate(90))
          if (opt.aspectRatio === 'Free') {
            const cropBox = self.cropper.cropBox
            cropBox.querySelector('span.cropper-view-box').style.outline =
              'none'
            self.cropper.disable()
          }
        }
      })
    },
    // 创建一些必要的DOM，用于图片裁剪
    createElement () {
      // 初始化图片为空对象
      this.preview = null
      // <img src="../../assets/app/loading.gif">
      let str =
        '<div><img id="clip_image" src="originUrl"></div><button type="button" id="cancel_clip">取消</button><button type="button" id="clip_button">确定</button>'
      str +=
        '<div class="crop_loading"><div class="crop_content"><div class="crop_text">修剪中...</div></div></div>'
      str +=
        '<div class="crop_success"><div class="crop_success_text">上传成功</div></div></div>'

      const body = document.getElementsByTagName('body')[0]
      this.reagion = document.createElement('div')
      this.reagion.id = 'clip_container'
      this.reagion.className = 'container'
      this.reagion.innerHTML = str
      // 添加创建好的DOM元素
      body.appendChild(this.reagion)
      this.preview = document.getElementById('clip_image')

      // 绑定一些方法
      this.initFunction()
    },
    // 初始化一些函数绑定
    initFunction () {
      const self = this
      this.clickBtn = document.getElementById('clip_button')
      this.cancelBtn = document.getElementById('cancel_clip')
      // 确定事件
      this.addEvent(this.clickBtn, 'click', function () {
        self.crop()
      })
      // 取消事件
      this.addEvent(this.cancelBtn, 'click', function () {
        self.destoried()
      })
      // 清空input的值
      this.addEvent(this.fileObj, 'click', function () {
        this.value = ''
      })
    },
    // 外部接口，用于input['file']对象change时的调用
    clip (e, opt) {
      // const self = this

      this.fileObj = e.srcElement

      const files = e.target.files || e.dataTransfer.files

      if (!files.length) return false // 不是图片直接返回

      // 调用初始化方法
      this.initilize(opt)

      // 获取图片文件资源
      this.picValue = files[0]

      // 去获取拍照时的信息，解决拍出来的照片旋转问题
      // Exif.getData( files[0] , function(){
      //   self.Orientation = Exif.getTag( files[0], 'Orientation');
      //   console.log(self.Orientation)
      // });

      // 调用方法转成url格式
      this.originUrl = this.getObjectURL(this.picValue)

      // 每次替换图片要重新得到新的url
      if (this.cropper) {
        this.cropper.replace(this.originUrl)
      }
    },
    // 图片转码方法
    getObjectURL (file) {
      let url = null
      if (window.createObjectURL !== undefined) {
        // basic
        url = window.createObjectURL(file)
      } else if (window.URL !== undefined) {
        // mozilla(firefox)
        url = window.URL.createObjectURL(file)
      } else if (window.webkitURL !== undefined) {
        // webkit or chrome
        url = window.webkitURL.createObjectURL(file)
      }
      return url
    },
    // 点击确定进行裁剪
    crop () {
      debugger
      const self = this
      const image = new Image()
      let croppedCanvas
      let roundedCanvas

      // Crop
      document.querySelector('.crop_loading').style.display = 'block'

      setTimeout(function () {
        croppedCanvas = self.cropper.getCroppedCanvas()
        // Round
        roundedCanvas = self.getRoundedCanvas(croppedCanvas)

        const imgData = roundedCanvas.toDataURL()
        image.src = imgData

        // 判断图片是否大于100k,不大于直接上传，反之压缩
        if (imgData.length < 100 * 1024) {
          self.resultObj.src = imgData
          // 图片上传
          self.postImg(imgData)
        } else {
          image.onload = function () {
            // 压缩处理
            const data = self.compress(image, self.Orientation)
            self.resultObj.src = data
            // 图片上传
            self.postImg(data)
          }
        }

        // 判断图片如果显示，则把相机给隐藏掉
        if (self.resultObj.src !== '') {
          document.getElementById('zyg-upload-icon').style.display = 'none'
        }

        // 调用后台接口，传参
        const params = {
          content: imgData, // 图片的base64码
          file: document.getElementById('fileId').files[0] // 获取文件流
        }
        self.$emit('after-upload', params) // 调用后台接口
      }, 20)
    },
    // 获取裁剪图片资源
    getRoundedCanvas (sourceCanvas) {
      const canvas = document.createElement('canvas')
      const context = canvas.getContext('2d')
      const width = sourceCanvas.width
      const height = sourceCanvas.height

      canvas.width = width
      canvas.height = height

      context.imageSmoothingEnabled = true
      context.drawImage(sourceCanvas, 0, 0, width, height)
      context.globalCompositeOperation = 'destination-in'
      context.beginPath()
      context.rect(0, 0, width, height)
      context.fill()

      return canvas
    },
    // 销毁原来的对象
    destoried () {
      // const self = this
      // 移除事件
      this.removeEvent(this.clickBtn, 'click', null)
      this.removeEvent(this.cancelBtn, 'click', null)
      this.removeEvent(this.fileObj, 'click', null)
      // 移除裁剪框
      this.reagion.parentNode.removeChild(this.reagion)

      // 销毁裁剪对象
      this.cropper.destroy()
      this.cropper = null
    },
    // 图片上传
    postImg (imageData) {
      // console.log(imageData)
      this.$emit('callback', imageData)
      // 这边写图片的上传
      const self = this
      self.destoried()

      // window.setTimeout( function () {
      //   document.querySelector('.crop_loading').style.display = 'none';
      //   document.querySelector('.crop_success').style.display = 'block';
      //   //裁剪完后摧毁对象
      //     self.destoried();
      // },3000)
    },
    // 图片旋转
    rotateImg (img, direction, canvas) {
      // 最小与最大旋转方向，图片旋转4次后回到原方向
      const min_step = 0
      const max_step = 3
      if (img === null) return
      // img的高度和宽度不能在img元素隐藏后获取，否则会出错
      const height = img.height
      const width = img.width
      let step = 2
      if (step === null) {
        step = min_step
      }
      if (direction === 'right') {
        step++
        // 旋转到原位置，即超过最大值
        step > max_step && (step = min_step)
      } else {
        step--
        step < min_step && (step = max_step)
      }
      // 旋转角度以弧度值为参数
      const degree = (step * 90 * Math.PI) / 180
      const ctx = canvas.getContext('2d')
      switch (step) {
        case 0:
          canvas.width = width
          canvas.height = height
          ctx.drawImage(img, 0, 0)
          break
        case 1:
          canvas.width = height
          canvas.height = width
          ctx.rotate(degree)
          ctx.drawImage(img, 0, -height)
          break
        case 2:
          canvas.width = width
          canvas.height = height
          ctx.rotate(degree)
          ctx.drawImage(img, -width, -height)
          break
        case 3:
          canvas.width = height
          canvas.height = width
          ctx.rotate(degree)
          ctx.drawImage(img, -width, 0)
          break
      }
    },
    // 图片压缩
    compress (img, Orientation) {
      const canvas = document.createElement('canvas')
      const ctx = canvas.getContext('2d')
      // 瓦片canvas
      const tCanvas = document.createElement('canvas')
      const tctx = tCanvas.getContext('2d')
      const initSize = img.src.length
      let width = img.width
      let height = img.height

      // 如果图片大于四百万像素，计算压缩比并将大小压至400万以下
      let ratio
      if ((ratio = (width * height) / 4000000) > 1) {
        console.log('大于400万像素')
        ratio = Math.sqrt(ratio)
        width /= ratio
        height /= ratio
      } else {
        ratio = 1
      }
      canvas.width = width
      canvas.height = height
      //        铺底色
      ctx.fillStyle = '#fff'
      ctx.fillRect(0, 0, canvas.width, canvas.height)
      // 如果图片像素大于100万则使用瓦片绘制
      let count
      if ((count = (width * height) / 1000000) > 1) {
        count = ~~(Math.sqrt(count) + 1) // 计算要分成多少块瓦片
        //            计算每块瓦片的宽和高
        const nw = ~~(width / count)
        const nh = ~~(height / count)
        tCanvas.width = nw
        tCanvas.height = nh
        for (let i = 0; i < count; i++) {
          for (let j = 0; j < count; j++) {
            tctx.drawImage(
              img,
              i * nw * ratio,
              j * nh * ratio,
              nw * ratio,
              nh * ratio,
              0,
              0,
              nw,
              nh
            )
            ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh)
          }
        }
      } else {
        ctx.drawImage(img, 0, 0, width, height)
      }
      // 修复ios上传图片的时候 被旋转的问题
      if (Orientation !== '' && Orientation !== 1) {
        switch (Orientation) {
          case 6: // 需要顺时针（向左）90度旋转
            this.rotateImg(img, 'left', canvas)
            break
          case 8: // 需要逆时针（向右）90度旋转
            this.rotateImg(img, 'right', canvas)
            break
          case 3: // 需要180度旋转
            this.rotateImg(img, 'right', canvas) // 转两次
            this.rotateImg(img, 'right', canvas)
            break
        }
      }
      // 进行最小压缩
      // let ndata = canvas.toDataURL( 'image/jpeg' , 0.1);
      const ndata = canvas.toDataURL('image/png', 0.1)
      console.log('压缩前：' + initSize)
      console.log('压缩后：' + ndata.length)
      console.log(
        '压缩率：' + ~~((100 * (initSize - ndata.length)) / initSize) + '%'
      )
      tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0

      return ndata
    },
    // 添加事件
    addEvent (obj, type, fn) {
      if (obj.addEventListener) {
        obj.addEventListener(type, fn, false)
      } else {
        obj.attachEvent('on' + type, fn)
      }
    },
    // 移除事件
    removeEvent (obj, type, fn) {
      if (obj.removeEventListener) {
        obj.removeEventListener(type, fn, false)
      } else {
        obj.detachEvent('on' + type, fn)
      }
    }
  }
}
</script>

<style scoped>
.zyg-uploader__upload {
  position: relative;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  box-sizing: border-box;
  width: 80px;
  height: 80px;
  margin: 0 8px 8px 0;
  background-color: #f7f8fa;
  border-radius: 8px;
}

.zyg-uploader__input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  cursor: pointer;
  opacity: 0;
  z-index: 99;
}

.zyg-image__img {
  object-fit: cover;
  display: block;
  width: 100%;
  height: 100%;
}
#zyg-upload-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}
#zyg-delete-icon {
  display: none;
  position: absolute;
  top: -8px;
  right: -8px;
  color: #969799;
  font-size: 18px;
  background-color: #fff;
  border-radius: 100%;
  z-index: 100;
}
.van-uploader__mask {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  color: #fff;
  background-color: rgba(50, 50, 51, 0.88);
  z-index: 1000;
}
</style>
<style>
input[type="file"] {
  outline: none;
  /*margin-top: 20px;*/
}

#clip_button {
  position: absolute;
  right: 10%;
  bottom: 20px;
  width: 80px;
  height: 40px;
  border: none;
  border-radius: 2px;
  background: #1AAD19;
  color: #fff;
}

#cancel_clip {
  position: absolute;
  left: 10%;
  bottom: 20px;
  width: 80px;
  height: 40px;
  border: none;
  border-radius: 2px;
  color: #fff;
  background: #E64340;
}

#clip_container.container {
  z-index: 99999;
  position: fixed;
  padding-top: 60px;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 1);
}

#clip_container.container > div {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

#clip_image {
  max-width: 100%;
}

.cropper-container {
  font-size: 0;
  line-height: 0;
  position: relative;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  direction: ltr;
  -ms-touch-action: none;
  touch-action: none;
}

.crop_loading,
.crop_success {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9;
}

.crop_loading .crop_content {
  position: fixed;
  top: 50%;
  left: 50%;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  box-sizing: content-box;
  width: 88px;
  max-width: 70%;
  min-height: 88px;
  padding: 10px;
  color: #fff;
  font-size: 14px;
  line-height: 20px;
  white-space: pre-wrap;
  text-align: center;
  word-wrap: break-word;
  background-color: rgba(0, 0, 0, 0.7);
  border-radius: 8px;
  -webkit-transform: translate3d(-50%, -50%, 0);
  transform: translate3d(-50%, -50%, 0);
}

.crop_loading .crop_content img {
  margin-top: 15px;
  margin-bottom: 10px;
}

.crop_success .crop_success_text {
  position: absolute;
  top: 50%;
  left: 50%;
  text-align: center;
  background: #000;
  opacity: 0.9;
  width: 120px;
  height: 30px;
  color: #fff;
  line-height: 30px;
  font-size: 16px;
  -webkit-border-radius: 3px;
  border-radius: 3px;
  -webkit-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.cropper-container img {
  /* Avoid margin top issue (Occur only when margin-top <= -height) */
  display: block;
  min-width: 0 !important;
  max-width: none !important;
  min-height: 0 !important;
  max-height: none !important;
  width: 100%;
  height: 100%;
  image-orientation: 0deg;
}

.cropper-wrap-box,
.cropper-canvas,
.cropper-drag-box,
.cropper-crop-box,
.cropper-modal {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.cropper-wrap-box {
  overflow: hidden;
}

.cropper-drag-box {
  opacity: 0;
  background-color: #fff;
}

.cropper-modal {
  opacity: 0.5;
  background-color: #000;
}

.cropper-view-box {
  display: block;
  overflow: hidden;
  width: 100%;
  height: 100%;
  outline: 1px solid #39f;
  outline-color: rgba(51, 153, 255, 0.75);
}

.cropper-dashed {
  position: absolute;
  display: block;
  opacity: 0.5;
  border: 0 dashed #eee;
}

.cropper-dashed.dashed-h {
  top: 33.33333%;
  left: 0;
  width: 100%;
  height: 33.33333%;
  border-top-width: 1px;
  border-bottom-width: 1px;
}

.cropper-dashed.dashed-v {
  top: 0;
  left: 33.33333%;
  width: 33.33333%;
  height: 100%;
  border-right-width: 1px;
  border-left-width: 1px;
}

.cropper-center {
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: 0;
  height: 0;
  opacity: 0.75;
}

.cropper-center:before,
.cropper-center:after {
  position: absolute;
  display: block;
  content: " ";
  background-color: #eee;
}

.cropper-center:before {
  top: 0;
  left: -3px;
  width: 7px;
  height: 1px;
}

.cropper-center:after {
  top: -3px;
  left: 0;
  width: 1px;
  height: 7px;
}

.cropper-face,
.cropper-line,
.cropper-point {
  position: absolute;
  display: block;
  width: 100%;
  height: 100%;
  opacity: 0.1;
}

.cropper-face {
  top: 0;
  left: 0;
  background-color: #fff;
}

.cropper-line {
  background-color: #39f;
}

.cropper-line.line-e {
  top: 0;
  right: -3px;
  width: 5px;
  cursor: e-resize;
}

.cropper-line.line-n {
  top: -3px;
  left: 0;
  height: 5px;
  cursor: n-resize;
}

.cropper-line.line-w {
  top: 0;
  left: -3px;
  width: 5px;
  cursor: w-resize;
}

.cropper-line.line-s {
  bottom: -3px;
  left: 0;
  height: 5px;
  cursor: s-resize;
}

.cropper-point {
  width: 5px;
  height: 5px;
  opacity: 0.75;
  background-color: #39f;
}

.cropper-point.point-e {
  top: 50%;
  right: -3px;
  margin-top: -3px;
  cursor: e-resize;
}

.cropper-point.point-n {
  top: -3px;
  left: 50%;
  margin-left: -3px;
  cursor: n-resize;
}

.cropper-point.point-w {
  top: 50%;
  left: -3px;
  margin-top: -3px;
  cursor: w-resize;
}

.cropper-point.point-s {
  bottom: -3px;
  left: 50%;
  margin-left: -3px;
  cursor: s-resize;
}

.cropper-point.point-ne {
  top: -3px;
  right: -3px;
  cursor: ne-resize;
}

.cropper-point.point-nw {
  top: -3px;
  left: -3px;
  cursor: nw-resize;
}

.cropper-point.point-sw {
  bottom: -3px;
  left: -3px;
  cursor: sw-resize;
}

.cropper-point.point-se {
  right: -3px;
  bottom: -3px;
  width: 20px;
  height: 20px;
  cursor: se-resize;
  opacity: 1;
}

@media (min-width: 768px) {
  .cropper-point.point-se {
    width: 15px;
    height: 15px;
  }
}

@media (min-width: 992px) {
  .cropper-point.point-se {
    width: 10px;
    height: 10px;
  }
}

@media (min-width: 1200px) {
  .cropper-point.point-se {
    width: 5px;
    height: 5px;
    opacity: 0.75;
  }
}

.cropper-point.point-se:before {
  position: absolute;
  right: -50%;
  bottom: -50%;
  display: block;
  width: 200%;
  height: 200%;
  content: " ";
  opacity: 0;
  background-color: #39f;
}

.cropper-invisible {
  opacity: 0;
}

.cropper-bg {
  background-image: url("");
}

.cropper-hide {
  position: absolute;
  display: block;
  width: 0;
  height: 0;
}

.cropper-hidden {
  display: none !important;
}

.cropper-move {
  cursor: move;
}

.cropper-crop {
  cursor: crosshair;
}

.cropper-disabled .cropper-drag-box,
.cropper-disabled .cropper-face,
.cropper-disabled .cropper-line,
.cropper-disabled .cropper-point {
  cursor: not-allowed;
}
</style>
